Royal Society of Chemistry, RSC Advances, 26(6), p. 22111-22120, 2016
DOI: 10.1039/c6ra00999a
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A facile and ecofriendly strategy to project and engineering new organic white LED is tested. The hybrid system was implemented by combining a commercial blue LED, with emission at 405 nm, with an hybrid transparent organic film (Polycarbonate, PMMA, PVC) containing two selected organic dyes. The emitting molecules, a home designed push-pull based Coumarin 1 and the DCM ([2-[2-[4-(dimethylamino)phenyl]ethenyl]-6-methyl-4H-pyran-4-ylidene]-propanedinitrile), were selected for their optical features and properly mixed to obtain the eye perception of white light through metamerism effect. The proposed strategy evidences the critical parameters to account for in the selection of the organic dyes, bearing in mind to preserve the dye emission properties from the solution to the solid state. To this purpose, the contribution of dynamic and static quenching effects were analyzed in detail, to single out the optimum concentrations to assure the compliance of the respective sphere of interaction and guarantee high optical performaces. Different hybrid new white-emitting LEDs with tunable color rendering index, from warm to cold CCD features, high energy efficiency, with a quantum yield larger than 90%, and high photostability were fulfilled to prove the proposed strategy.